TREM2 and cancer: No correlation was detected between TREM2 expression and DFI in any type of cancer (Figure 4E; all p > 0.05); however, significant relationships were detected in KIRP (Figure 4F; p = 0.020), CESC (Figure 4G; p = 0.037), and PCPG (Figure 4H; p = 0.028) by KM survival analysis.